<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>

  <body>
    <script>
      //请实现以下效果
      function add(a, b, c) {
        return a + b + c;
      }
      // console.log(add.length);

      const res = add(1, 2, 3); // 6

      function curry(fun) {
        return function curried(...args) {
          if (args.length >= fun.length) {
            return fun.apply(this, args);
          } else {
            return function (...args2) {
              return curried.apply(this, args.concat(args2));
            };
          }
        };
      }

      let addCurry = curry(add);

      // console.log(addCurry);
      const res2 = addCurry(1)(2)(3); // 6

      console.log(res2);
    </script>
  </body>
</html>
